Like the credit cooperatives, credit unions form associations of a higher level, which are called corporate credit unions. The uniqueness of credit unions is that they put together the principles and benefits of financial cooperatives, consumer cooperatives and mutual aid funds, born once by trade unions. Income received by the credit union shall be distributed among the shareholders or spent for the depreciation of services, that is, are the most effective means of meeting the needs of shareholders. Cooperation between credit unions, how they would not have been named, took place always, from the moment when the movement moved outside one credit union. Credit cooperatives and credit unions exist in many different forms. The main differences relate to the nature of the membership and the opening of a credit institution. Corporate alliances are intermediaries between credit unions and financial markets.